sin(xy)=x 求dx/dysec(xy)-y ]/x 还是 x/[sec(xy)-y]
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sin(xy)=x求dx/dysec(xy)-y]/x还是x/[sec(xy)-y]sin(xy)=x求dx/dysec(xy)-y]/x还是x/[sec(xy)-y]sin(xy)=x求dx/dys
sin(xy)=x 求dx/dysec(xy)-y ]/x 还是 x/[sec(xy)-y]
sin(xy)=x 求dx/dy
sec(xy)-y ]/x 还是 x/[sec(xy)-y]
sin(xy)=x 求dx/dysec(xy)-y ]/x 还是 x/[sec(xy)-y]
x/[sec(xy)-y]
dx/dy .
dsin(xy)=dx
cos(xy)d(xy)=dx
cos(xy)(xdy+ydx)=dx
xcos(xy)dy+ycos(xy)dx=dx
dy/dx=[1-ycos(xy)]/xcos(xy)=[sec(xy)-y]/x